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Finding the Fourth Proportional to 485.23, 669.01 and 288.67

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Solution

The fourth proportional to 485.23, 669.01 and 288.67 is: 398.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.23 : 669.01 = 288.67 : x
  2. Step 2: Convert to fraction form
    485.23/669.01 = 288.67/x
  3. Step 3: Cross multiply
    485.23x = 669.01 × 288.67
  4. Step 4: Simplify right side
    485.23x = 193,123.12
  5. Step 5: Solve for x
    x = 193,123.12/485.23
  6. Step 6: Final answer
    x = 398.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.